Cook the macaroni according to the instructions on the packet, then drain and leave to cool. Drain the tuna and flake with a fork. Combine the tuna with the mayonnaise and season with salt and pepper. Mix the cucumber with a pinch of salt and set aside for 5 minutes, then squeeze out the excess liquid with your hands. Soak the onion in a bowl of water for 5 minutes to soften its flavour, then drain well. Mix all the ingredients together thoroughly before serving.
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